Anti-freezing valve body and gas water heater comprising same

Abstract

The application discloses a kind of anti-freezing valve body and the gas water heater comprising it, anti-freezing valve body includes first pipe fitting, second pipe fitting and drive mechanism, second pipe fitting is communicated with first pipe fitting, drive mechanism has first state and second state, from first temperature to second temperature in the process of reduction, drive mechanism is switched from first state to second state, so that first pipe fitting and second pipe fitting can be relatively far away under the action of external force, to realize that the space of water flow passage between first pipe fitting and second pipe fitting is larger.The anti-freezing valve body in the application, in the case where water is continuously supplied without power, when temperature decreases, drive mechanism makes first pipe fitting and second pipe fitting relatively far away, so that the space of water flow passage between first pipe fitting and second pipe fitting is larger, once water is frozen into ice, the volume of water frozen into ice after increasing is released, prevent the whole water flow passage from being cracked or frozen, avoid the occurrence of whole machine water leakage, floor water, electrical leakage and other property losses and endanger safety.

Description

[0001] This application is a divisional application of the Chinese patent application No. 202210458463.7, with a filing date of April 27, 2022. TECHNICAL FIELD

[0002] The present application relates to a freeze-proof valve body and a gas water heater comprising the same. BACKGROUND

[0003] In winter, the arrival of cold air causes a rapid drop in temperature. The water in the waterway of the gas water heater freezes due to the low air temperature, and the ice expands outward, which can easily cause damage to the pipeline, leading to the gas water heater cracking event. Currently, the gas water heaters on the market mainly use anti-freezing heating blocks to prevent freezing. The anti-freezing heating blocks need to be powered on to function. In the case of power failure, gas failure, and continuous water, the anti-freezing heating blocks cannot effectively prevent freezing. This can cause the pipeline in the gas water heater to freeze and crack, and if the water inlet valve is not closed in time, it can cause the entire machine to leak water, and cause the floor to be flooded, electrical leakage, and other property losses and safety hazards. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defect that the pipeline in the gas water heater is prone to freeze and crack in the case of power failure. The present application provides a freeze-proof valve body and a gas water heater comprising the same.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] The present application provides a freeze-proof valve body, which comprises:

[0007] a first pipe;

[0008] a second pipe in communication with the first pipe;

[0009] a driving mechanism having a first state and a second state, wherein during the process of reducing the temperature from a first temperature to a second temperature, the driving mechanism switches from the first state to the second state, so that the first pipe and the second pipe can relatively move away under the action of an external force, so as to increase the space of the water flow passage between the first pipe and the second pipe.

[0010] In the present application, the above structure is adopted. In the case of power failure and continuous water, when the water temperature drops to the second temperature, the driving mechanism causes the first pipe and the second pipe to relatively move away, so as to increase the space of the water flow passage between the first pipe and the second pipe. Once the water freezes into ice, the increased volume of the ice after freezing is released, thereby preventing the entire water flow passage from being cracked or frozen, and further reducing or avoiding the occurrence of the entire machine leaking water, the floor being flooded, electrical leakage, and other property losses and safety hazards.

[0011] Preferably, the driving mechanism comprises a clamping member connected with the first pipe, when the driving mechanism is in the first state, the clamping member is clamped with the second pipe to fix the second pipe and the first pipe relatively; when the driving mechanism is in the second state, the clamping member is disengaged from the second pipe to make the second pipe and the first pipe relatively far away or close to each other.

[0012] In the scheme, the relative fixation and disengagement between the second pipe and the first pipe are realized through the cooperation between the clamping member and the second pipe, which facilitates the control of the relative position between the first pipe and the second pipe.

[0013] Preferably, the clamping member is arranged in the second pipe.

[0014] In the scheme, the above structure is adopted, and the space layout is reasonable, so that the anti-frost cracking valve body structure is compact.

[0015] Preferably, a skin film is mounted on the end of the first pipe away from the second pipe, and the clamping member is connected with the skin film through a connecting rod.

[0016] In the scheme, in the case that water flows into the water flow channel, due to the action of water pressure, the skin film will form a pulling force in the direction away from the second pipe, and then limit the clamping member to avoid the clamping member from shaking, thereby strengthening the clamping effect between the clamping member and the second pipe and preventing the clamping member from disengaging from the second pipe.

[0017] Preferably, the anti-frost cracking valve body comprises a reset member, during the process from the second temperature to the first temperature, the reset member makes the first pipe and the second pipe close to each other and return to the initial relative position.

[0018] In the scheme, during the process from the second temperature to the first temperature, the reset member makes the movable channel between the first pipe and the second pipe smaller in volume and returns to the initial state to realize automatic reset.

[0019] Preferably, the reset member comprises a first telescopic driving member, the first telescopic driving member is arranged in the second pipe, and the two ends of the first telescopic driving member abut against the clamping member and the second pipe respectively, during the process from the second temperature to the first temperature, the first telescopic driving member is stretched to realize the relative movement between the first pipe and the second pipe.

[0020] In the scheme, the first telescopic driving member is stretched to realize the relative movement of the first pipe member and the second pipe member, so that the first pipe member and the second pipe member return to the initial relative position to realize resetting.

[0021] Preferably, the first telescopic driving member is a first memory alloy elastic member.

[0022] In the scheme, the above structure is adopted, without the need of driving by electricity, and a mechanical structure is adopted to realize that the water flow channel between the first pipe member and the second pipe member can be adjusted according to the change of temperature, and the reliability is good, and effective protection can be realized when power is off.

[0023] Preferably, the clamping member comprises a sleeve and a clamping rod, the clamping rod is arranged in the sleeve, a through hole is formed in the side wall of the sleeve, and the clamping rod can pass through the through hole and be clamped with the second pipe member.

[0024] In the scheme, the above structure is adopted, the clamping rod is arranged in the sleeve, the erosion of water flow to the clamping rod is reduced, the abrasion of the clamping rod is reduced, and the service life of the clamping rod is prolonged. The through hole arranged on the sleeve enables the clamping rod to be clamped with the second pipe member.

[0025] Preferably, the clamping member further comprises a second telescopic driving member connected with the clamping rod, and in the process of switching between the first temperature and the second temperature, the second telescopic driving member drives the clamping rod to move along the through hole through telescoping.

[0026] In the scheme, the above structure is adopted, the second telescopic driving member changes the telescoping amount according to the change of temperature to drive the clamping rod to move away from or close to the second pipe member, so as to control the clamping relationship between the clamping rod and the second pipe member, and automation control is facilitated and management is easy.

[0027] Preferably, the clamping rod comprises a first rod member and a second rod member fixed in cross, the second telescopic driving member is arranged on the outer circumferential side of the first rod member, and the two ends of the second telescopic driving member abut against the second rod member and the inner wall of the sleeve respectively to drive the first rod member to move along the extension direction thereof.

[0028] In the scheme, the above structure is adopted, since the first rod member and the second rod member are fixed in cross, the first rod member can be pushed to move away from or close to the inner wall of the sleeve abutting against the second telescopic driving member in the process that the second telescopic driving member pushes the second rod member to move, so as to realize the cooperation between the clamping rod and the second pipe member, the space layout is reasonable and compact, and the structure is simple and convenient for processing.

[0029] Preferably, the second telescopic driving member is a second memory alloy elastic member.

[0030] In this solution, the above-mentioned structure is adopted. During the process of cooling from the first temperature to the second temperature, the second shape memory alloy elastic element contracts, driving the first rod to move away from the second pipe. When the temperature rises from the second temperature to the first temperature, the second shape memory alloy elastic element extends, pushing the first rod to move closer to the second pipe. Without the need for electric drive, a mechanical structure is used to realize the snap-fit ​​and de-snap relationship between the snap-fit ​​element and the second pipe. It has good reliability and can provide effective protection in the event of power failure.

[0031] Preferably, the inner wall of the second pipe fitting has a groove to engage with the snap-fit ​​component.

[0032] In this solution, the above-mentioned structural form is adopted, which is convenient for processing, and the snap-fit ​​relationship is formed by the cooperation between the snap-fit ​​component and the groove, resulting in a stable snap-fit ​​effect.

[0033] Preferably, the second pipe fitting is partially placed inside the first pipe fitting, the side wall of the first pipe fitting is provided with a water inlet, the water inlet is located in the non-overlapping area between the first pipe fitting and the second pipe fitting, and a sealing ring is provided between the inner wall of the first pipe fitting and the outer wall of the second pipe fitting.

[0034] In this solution, the above-mentioned structural form is adopted to prevent water from flowing out from the gap between the inner wall of the first pipe and the outer wall of the second pipe, so that the antifreeze and crack valve body has good sealing performance.

[0035] The present invention also provides a gas water heater, which includes the anti-freeze and crack valve body as described above.

[0036] Preferably, the antifreeze valve body is connected to the water inlet pipe, and an outlet is opened at the end of the second pipe that is away from the first pipe. A movable connecting pipe is installed between the outlet and the water inlet pipe.

[0037] In this solution, the above-mentioned structural form is adopted. Since the second pipe can move away from or towards the first pipe, the second pipe is movably set. The end of the second pipe away from the first pipe is connected to the water inlet pipe through a movable connecting pipe. This reduces or avoids the phenomenon that the water inlet pipe needs to move with the second pipe, which could lead to damage. It also eliminates the need to reserve a larger assembly space when the water inlet pipe needs to move. The structure is compact.

[0038] The positive and progressive effects of this invention are as follows:

[0039] In this invention, the anti-freeze valve body, even when power is off but water supply is not interrupted, will cause the first and second pipes to move away from each other when the water temperature drops to a second temperature. This increases the space of the water flow channel between the first and second pipes. Once the water freezes, the increased volume is released, thus preventing the entire water flow channel from bursting or freezing. This reduces or avoids property damage and safety hazards such as leaks in the entire machine, flooded floors, and electrical leaks. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the drive mechanism in the first state of the antifreeze crack valve body according to a preferred embodiment of the present invention.

[0041] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0042] Figure 3 A schematic diagram of the drive mechanism in the second state of the antifreeze crack valve body according to a preferred embodiment of the invention.

[0043] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0044] Figure 5 This is a schematic diagram of the installation of the antifreeze valve body in a gas water heater according to a preferred embodiment of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] First fitting 1

[0047] Skin 11

[0048] Connecting rod 12

[0049] Inlet 13

[0050] Second pipe fitting 2

[0051] Groove 21

[0052] Outlet 22

[0053] Drive mechanism 3

[0054] Card connector 31

[0055] Sleeve 311

[0056] Through hole 3111

[0057] 312 Snap-on lever

[0058] First member 3121

[0059] Second member 3122

[0060] Second telescopic drive member 313

[0061] Reset member 4

[0062] First telescopic drive member 41

[0063] Sealing ring 5

[0064] Water inlet pipeline 6

[0065] Movable connecting pipe 7 DETAILED DESCRIPTION

[0066] The application will be further described in the following examples, but the application is not limited to the following examples.

[0067] The application provides a freeze-cracking prevention valve body, please refer to Figures 1 to 5 The freeze-cracking prevention valve body comprises a first pipe member 1, a second pipe member 2 and a drive mechanism 3, the first pipe member 1 and the second pipe member 2 are communicated, the drive mechanism 3 has a first state and a second state, in the process of decreasing from a first temperature to a second temperature, the drive mechanism 3 is switched from the first state to the second state, so that the first pipe member 1 and the second pipe member 2 can relatively move away under the action of an external force, to realize that the space of the water flow passage between the first pipe member 1 and the second pipe member 2 is enlarged. Wherein, the first temperature is that the water temperature is above 0 degrees Celsius, and the second temperature is that the water temperature is below 0 degrees Celsius. At this time, the temperature is at the first temperature, the drive mechanism 3 is at the first state, and the relative position between the first pipe member 1 and the second pipe member 2 is as shown in Figure 1 . In the process of decreasing from the first temperature to the second temperature, the drive mechanism 3 is switched to the second state, and the relative position between the first pipe member 1 and the second pipe member 2 is as shown in Figure 3 . It can be seen that, in the process of decreasing from the first temperature to the second temperature, the second pipe member 2 and the first pipe member 1 move away from each other, so that the water flow passage between the first pipe member 1 and the second pipe member 2 forms a movable passage, and the space of the movable passage is enlarged.

[0068] In this embodiment, in the case of continuous water supply under power failure, when the water temperature decreases to the second temperature, the drive mechanism 3 makes the first pipe member 1 and the second pipe member 2 relatively move away, so that the space of the water flow passage between the first pipe member 1 and the second pipe member 2 is enlarged, once the water is frozen into ice, the volume of the ice after being frozen is released, so as to prevent the whole water flow passage from being cracked or frozen, and further to reduce or avoid the property loss and the situation of endangering safety such as machine water leakage, floor water bubble, electrical leakage and the like.

[0069] The driving mechanism 3 comprises a clamping piece 31 connected with the first pipe 1. When the driving mechanism 3 is in the first state, the clamping piece 31 is clamped with the second pipe 2, so that the second pipe 2 and the first pipe 1 are relatively fixed. When the driving mechanism 3 is in the second state, the clamping piece 31 is unclamped with the second pipe 2, so that the second pipe 2 and the first pipe 1 are relatively away or close. The relative fixation and disengagement between the second pipe 2 and the first pipe 1 is realized through the cooperation between the clamping piece 31 and the second pipe 2, which facilitates the control of the relative position between the first pipe 1 and the second pipe 2.

[0070] In the embodiment, the clamping piece 31 is arranged in the second pipe 2, which is reasonable in space layout, so that the anti-frost cracking valve body structure is compact. The first pipe 1 is provided with a skin film 11 at the end away from the second pipe 2, and the clamping piece 31 is connected with the skin film 11 through a connecting rod 12. In the case that water flows into the water flow channel, the skin film 11 will form a pulling force away from the second pipe 2 due to the action of water pressure, and then limit the clamping piece 31 to avoid the shaking of the clamping piece 31, thereby enhancing the clamping effect between the clamping piece 31 and the second pipe 2 and preventing the clamping piece 31 from being separated from the second pipe 2.

[0071] In the embodiment, the anti-frost cracking valve body comprises a reset piece 4. During the process of rising from the second temperature to the first temperature, the reset piece 4 makes the first pipe 1 and the second pipe 2 close to each other and return to the initial relative position. During the process of rising from the second temperature to the first temperature, the reset piece 4 makes the movable channel between the first pipe 1 and the second pipe 2 smaller in volume and return to the initial state, so as to realize automatic reset.

[0072] In other embodiments, the anti-frost cracking valve body comprises a first pipe 1, a second pipe 2, a driving mechanism 3 and a reset piece 4. The first pipe 1 and the second pipe 2 are communicated. The driving mechanism 3 has a first state and a second state. During the process of falling from the first temperature to the second temperature, the driving mechanism 3 is switched from the first state to the second state, so that the first pipe 1 and the second pipe 2 can be relatively away under the action of external force, so as to realize the increase of the space of the water flow channel between the first pipe 1 and the second pipe 2. During the process of rising from the second temperature to the first temperature, the reset piece 4 makes the first pipe 1 and the second pipe 2 close to each other and return to the initial relative position.

[0073] The reset member 4 comprises a first telescopic driving member 41 arranged in the second pipe member 2, and the two ends of the first telescopic driving member 41 abut against the clamping member 31 and the second pipe member 2 respectively. During the process from the second temperature to the first temperature, the first telescopic driving member 41 is stretched to realize the relative movement of the first pipe member 1 and the second pipe member 2, so that the first pipe member 1 and the second pipe member 2 return to the initial relative position to realize the reset. The first telescopic driving member 41 is arranged on the outer circumferential side of the connecting rod 12, and one end of the first telescopic driving member 41 abuts against the clamping member 31 connected with the first pipe member 1, and the other end abuts against the second pipe member 2.

[0074] The first telescopic driving member 41 is a first memory alloy elastic member. The first memory alloy elastic member changes its telescopic amount with the change of temperature. When the temperature rises, the elasticity increases, and the first memory alloy elastic member is elongated. When the temperature decreases, the elasticity decreases, and the first memory alloy elastic member is contracted. During the process from the first temperature to the second temperature, the clamping member 31 and the second pipe member 2 are disengaged, the water is frozen into ice, the volume is increased, the first pipe member 1 and the second pipe member 2 are relatively far away from each other, the space for the water after being frozen into ice is reserved for the movable water flow channel, the space after the water is frozen into ice is released, and at this time, the first memory alloy elastic member is contracted, and does not interfere with the relative movement of the first pipe member 1 and the second pipe member 2. When the temperature rises from the second temperature to the first temperature, the first memory alloy elastic member is elongated, so that the first pipe member 1 and the second pipe member 2 are close to each other to return to the initial relative position to realize the reset. The anti-freezing and cracking valve body of the embodiment does not need to be driven by electricity, and adopts a mechanical structure to realize the adjustable water flow channel between the first pipe member 1 and the second pipe member 2 according to the change of temperature, has good reliability, and can effectively protect when power is off. Preferably, the first telescopic driving member 41 is a memory alloy spring, which is convenient to process and has good telescopic performance.

[0075] As shown in FIGS. 1, 2 and 3, Figure 2 and Figure 4 In the embodiment, the clamping member 31 comprises a sleeve 311 and a clamping rod 312, the clamping rod 312 is arranged in the sleeve 311, a through hole 3111 is formed in the side wall of the sleeve 311, and the clamping rod 312 can pass through the through hole 3111 and be clamped with the second pipe member 2. The clamping rod 312 is arranged in the sleeve 311, which reduces the erosion of the water flow to the clamping rod 312, further reduces the abrasion of the clamping rod 312, and prolongs the service life of the clamping rod 312. The through hole 3111 arranged on the sleeve 311 enables the clamping rod 312 to be clamped with the second pipe member 2.

[0076] The clamping piece 31 further comprises a second telescopic driving piece 313 connected with the clamping rod 312, which drives the clamping rod 312 to move along the through hole 3111 through telescoping during switching between the first temperature and the second temperature. During the process of decreasing from the first temperature to the second temperature, the second telescopic driving piece 313 is affected by the temperature, and the telescoping amount thereof changes, thereby driving the clamping rod 312 connected therewith to pass through the through hole 3111 and extend out of the sleeve 311 to achieve clamping with the second pipe piece 2, thereby achieving relative fixation between the first pipe piece 1 and the second pipe piece 2; during the process of increasing from the second temperature to the first temperature, the second telescopic driving piece 313 is affected by the temperature, and the telescoping amount thereof changes, thereby driving the clamping rod 312 connected therewith to move away from the second pipe piece 2, so that the second pipe piece 2 and the clamping piece 31 can move relatively, that is, the second pipe piece 2 and the first pipe piece 1 can move relatively. The second telescopic driving piece 313 changes the telescoping amount thereof according to the change of the temperature, to drive the clamping rod 312 to move away from or close to the second pipe piece 2, thereby controlling the clamping relationship between the clamping rod 312 and the second pipe piece 2, facilitating automatic control and easy management.

[0077] The clamping rod 312 comprises a first rod piece 3121 and a second rod piece 3122 fixed in cross, the second telescopic driving piece 313 is sleeved on the outer circumferential side of the first rod piece 3121, and the two ends of the second telescopic driving piece 313 abut against the second rod piece 3122 and the inner wall of the sleeve 311 respectively, to drive the first rod piece 3121 to move along the extension direction thereof. Since the first rod piece 3121 and the second rod piece 3122 are fixed in cross, during the process of the second telescopic driving piece 313 driving the second rod piece 3122 to move by telescoping, the first rod piece 3121 can be driven to move away from or close to the inner wall of the sleeve 311 abutting against the second telescopic driving piece 313, thereby achieving cooperation between the clamping rod 312 and the second pipe piece 2, reasonable and compact spatial layout, and simple structure, facilitating processing.

[0078] Specifically, the first rod piece 3121 and the second rod piece 3122 are arranged perpendicularly to each other, and the length direction of the first rod piece 3121 is located on the same straight line as the axis direction of the through hole 3111, so that the first rod piece 3121 has less possibility of being blocked when passing through the through hole 3111.

[0079] The second telescopic driving member 313 is a second memory alloy elastic member. During the process of decreasing from the first temperature to the second temperature, the second memory alloy elastic member contracts to drive the first rod member 3121 to move away from the second pipe member 2; during the process of increasing from the second temperature to the first temperature, the second memory alloy elastic member extends to push the first rod member 3121 to move close to the second pipe member 2. Without the need of driving by electricity, the mechanical structure is adopted to realize the clamping and unclamping relationship between the clamping member 31 and the second pipe member 2, which is good in reliability and can effectively protect when power is off. Preferably, the second telescopic driving member 313 is a memory alloy spring, which is convenient to process and good in telescopic performance. The first memory alloy elastic member and the second memory alloy elastic member can be made of the same material.

[0080] The inner wall of the second pipe member 2 is provided with a groove 21 to cooperate with the clamping member 31 to clamp, which is convenient to process and stable in clamping effect through the cooperation between the clamping member 31 and the groove 21 to form the clamping relationship.

[0081] The second pipe member 2 is partially arranged in the first pipe member 1, the side wall of the first pipe member 1 is provided with a water inlet 13, the water inlet 13 is located in the non-overlapping area between the first pipe member 1 and the second pipe member 2, and the inner wall of the first pipe member 1 and the outer wall of the second pipe member 2 are provided with a sealing ring 5. The sealing ring 5 is arranged to prevent water from flowing out from the gap between the inner wall of the first pipe member 1 and the outer wall of the second pipe member 2, so that the frost crack valve body is good in sealing performance.

[0082] In specific use, in the case of uninterrupted power supply, in normal use, the driving mechanism 3 is in the first state, the clamping piece 31 is clamped between the second pipe 2, and the skin film 11 at the end of the first pipe 1 forms an outward pulling force due to the action of water pressure, which limits the clamping piece 31 and the second pipe 2, so that the second pipe 2 cannot move relative to the first pipe 1. When the temperature decreases, the elastic force of the first and second memory alloy elastic pieces gradually decreases, and when the temperature decreases to the second temperature, i.e. the water temperature decreases to 0 degrees Celsius or below, the second memory alloy elastic piece is compressed to make the clamping rod 312 away from the second pipe 2 and the clamping relationship with the second pipe 2 is released, and the water freezing process volume increases to push the second pipe 2 away from the first pipe 1, and the space for the movable water flow channel after the water is frozen is reserved, so that the space after the water is frozen is released, and at this time the first memory alloy elastic piece is contracted and does not interfere with the relative movement of the first pipe 1 and the second pipe 2. When the temperature rises, the elastic force of the first and second memory alloy elastic pieces gradually increases, the first memory alloy elastic piece is elongated to make the second pipe 2 gradually close to the first pipe 1 and return to the initial relative position, and the second memory alloy elastic piece is gradually elongated to push the clamping rod 312 into the groove 21 of the second pipe 2, realize the fixation of the first pipe 1 relative to the second pipe 2, automatic reset, return to the initial state, prepare for the next use. The scheme adopts a pure mechanical mechanism, which can effectively protect when power is off.

[0083] In other embodiments, when the temperature decreases to the second temperature, the water freezing process can also push the first pipe 1 away from the second pipe 2, and when the temperature rises, the elastic force of the first and second memory alloy elastic pieces gradually increases, and the first memory alloy elastic piece is elongated to make the first pipe 1 gradually close to the second pipe 2 and return to the initial relative position.

[0084] The embodiment of the application also provides a gas water heater. Figure 5 As shown, the gas water heater comprises the anti-freezing and cracking valve body according to any one of the above embodiments.

[0085] In the embodiment, the anti-freezing valve body is connected to the water inlet pipeline 6, the water outlet 22 is arranged at the end of the second pipe 2 far from the first pipe 1, and the movable connecting pipe 7 is arranged between the water outlet 22 and the water inlet pipeline 6. The water inlet 13 is arranged on the side wall of the end of the first pipe 1 far from the second pipe 2, the water flows into the movable channel between the first pipe 1 and the second pipe 2 through the water inlet 13, and then flows out of the anti-freezing valve body through the water outlet 22 to enter the water inlet pipeline 6. Since the second pipe 2 can move away from or close to the first pipe 1, the second pipe 2 is movably arranged, the end of the second pipe 2 far from the first pipe 1 is connected to the water inlet pipeline 6 through the movable connecting pipe 7, the phenomenon that the water inlet pipeline 6 needs to move along with the movement of the second pipe 2 is reduced or avoided, thereby avoiding damage, and there is no need to consider reserving larger assembly space for the water inlet pipeline 6 in the case that the water inlet pipeline 6 needs to move, and the structure is compact.

[0086] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. A freeze crack resistant valve body characterized by, The anti-freezing and cracking valve body comprises: a first pipe; a second pipe in communication with the first pipe; a driving mechanism having a first state and a second state, during the process from a first temperature to a second temperature, the driving mechanism switches from the first state to the second state, so that the first pipe and the second pipe can relatively move away under external force, to realize the space of the water flow passage between the first pipe and the second pipe becomes larger; the driving mechanism comprises a clamping piece connected with the first pipe, when the driving mechanism is in the first state, the clamping piece is clamped with the second pipe, so that the second pipe and the first pipe are relatively fixed; when the driving mechanism is in the second state, the clamping piece is unclamped with the second pipe, so that the second pipe and the first pipe relatively move away or close to each other; the clamping piece is arranged in the second pipe; an end of the first pipe away from the second pipe is provided with a skin, and the clamping piece is connected with the skin through a connecting rod.

2. The freeze crack resistant valve body of claim 1, wherein The anti-freezing and cracking valve body comprises a reset piece, during the process from the second temperature to the first temperature, the reset piece makes the first pipe and the second pipe close to each other and return to the initial relative position.

3. The freeze crack resistant valve body of claim 2, wherein The reset piece comprises a first stretchable driving piece, the first stretchable driving piece is arranged in the second pipe, and two ends of the first stretchable driving piece abut against the clamping piece and the second pipe respectively, during the process from the second temperature to the first temperature, the first stretchable driving piece is stretched to realize the relative movement of the first pipe and the second pipe.

4. The freeze crack resistant valve body of claim 3, wherein The first stretchable driving piece is a first memory alloy elastic piece.

5. The freeze crack resistant valve body of claim 1 wherein, The clamping piece comprises a sleeve and a clamping rod, the clamping rod is arranged in the sleeve, a through hole is formed in the side wall of the sleeve, and the clamping rod can pass through the through hole and be clamped with the second pipe.

6. The freeze crack resistant valve body of claim 5, wherein The clamping piece further comprises a second stretchable driving piece connected with the clamping rod, during the process of switching between the first temperature and the second temperature, the second stretchable driving piece drives the clamping rod to move along the through hole through stretching and contraction.

7. The freeze crack resistant valve body of claim 6 wherein, The clamping rod comprises a first rod piece and a second rod piece fixedly crossed, the second stretchable driving piece is arranged on the outer circumferential side of the first rod piece, and two ends of the second stretchable driving piece abut against the second rod piece and the inner wall of the sleeve respectively, to drive the first rod piece to move along the extension direction thereof.

8. The freeze crack resistant valve body of claim 6, wherein The second stretchable driving piece is a second memory alloy elastic piece.

9. The freeze crack resistant valve body of claim 1 wherein, A groove is formed in the inner wall of the second pipe to cooperate with the clamping piece.

10. The freeze crack resistant valve body of claim 1 wherein, The second pipe is partially arranged in the first pipe, the side wall of the first pipe is provided with a water inlet, the water inlet is located in the non-overlapping area between the first pipe and the second pipe, and a sealing ring is arranged between the inner wall of the first pipe and the outer wall of the second pipe.

11. A gas water heater, characterised by, The gas water heater comprises the anti-freezing and cracking valve body according to any one of claims 1-10.

12. The gas water heater of claim 11, wherein, The anti-freezing and cracking valve body is connected to a water inlet pipeline, an outlet is arranged at an end of the second pipe far from the first pipe, and a movable connecting pipe is arranged between the outlet and the water inlet pipeline.

Images